48.3848° N, 114.1186° W

Satellite · Esri, Maxar, Earthstar Geographics

360° capture coming

GSV coverage on US-2 at the access turnoff, checked 2026-07-23. Use official Maps Embed API iframe (free); cannot rehost tiles per Google ToS. Mapillary CC-licensed 360 worth checking (needs free token) if we want it in our own viewer.

Measured in the field by FRA

The Flathead Rivers Alliance has published an access sheet for this launch, and it says the engineering statistics are not available yet. Read FRA's access description for the available site details.

House of Mystery River Access

This undeveloped access approximately 1 R.M. downstream from the confluence for the main Flathead River is used by recreators floating the lower miles of the Wild and Scenic Middle Fork or the undesignated stretch of the South Fork below the Hungry Horse Dam. A steep and heavily used gravel road makes multiple switchbacks down to an eroded beach launch.

Access concerns

Verbatim from the survey

Launch washes out at high water, making put-ins and take-outs dynamic and challenging.
Site is often extremely muddy after periods of rain.

Photographs

Terrain360 · July 2026

Field photography Terrain360, July 2026 · site photos courtesy Flathead Rivers Alliance

Getting there

From the intersection of MT Highway 206 and US Highway 2, travel east for 2.1 miles. Turn left on the gravel drive immediately after the Glacier Ziplines property.

Open in maps

Access site lens

Supporting evidence · FRA access sheet · Jul 2026

Derived from the 360 imagery, not measured on site. Where it disagrees with the survey above, the survey is correct.

Launch profile

FRA access description: Vehicle accessible bar Packed dirt, pebble bar
Kayaks + canoes: Good
Paddleboards: Good
Carry to the water: Not assessable from the source imagery
Carry terrain: Flat unpaved
Carry obstacles: Mud, rocks

Safety + condition

Safety interpretation: Fair
Overall condition: Fair
Access hazards: Steep banks · Unstable footing · Submerged hazards likely
Water obstacles: None observed in the source
Deferred maintenance signal: Observed

Accessibility observations

Mobility device interpretation: Not suitable
Designated accessible parking: None
Route shown in sheet: Not observed
Route obstacles: Steep grades, rough surface
Observed barriers: Steep grades, rough surfaces
Accessible water feature: Not observed

Visitor management

Parking estimate: Not assessable from the source imagery
Simultaneous launch capacity: Single
Launch queue evidence: None
Designated camping indicated: Not assessable from the source imagery
Registration infrastructure: None identified in the source sheet

Experience indicators

Setting: Semi primitive
Recreation character: Lightly managed
Development in view: None
Social trails: Isolated
Informal campsite evidence: Not observed
Use-conflict evidence: None observed in the source

Recreation profile

Observed recreation: Paddling, none observed
Water skill interpretation: Varies by conditions
Physical ability interpretation: Moderate
Wear patterns: Moderate
Heavy-use signals: Bare soil, rutting
Privacy: Secluded

Curated RAPG fields are interpreted from the FRA access sheet and its photographs. Conditions may extend beyond the photographed views. FRA’s field measurements in the Measured access card remain the authority for access type, grades, widths, surfaces, gaps, and accessible parking.

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Audio description

A narrated walk-through of this site: the ramp, the gaps, the surfaces, and the hazards, read from the survey and the 360 imagery.

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Read the transcript

House of Mystery, on the main stem Flathead of the Flathead.

From the intersection of MT 206 and Highway 2, travel east for 2.1 miles. Turn left on the gravel drive immediately after the Glacier Ziplines property.

The parking area is packed dirt.

There is no designated accessible parking.

The Flathead Rivers Alliance has not published measured survey data for this site yet, so the details that follow come from the site description rather than from field measurements.

The launch itself is vehicle accessible bar packed dirt, pebble bar.

What to watch for, in the survey crew's own words:

Launch washes out at high water, making put-ins and take-outs dynamic and challenging.

Site is often extremely muddy after periods of rain.

There are no facilities at this site.

This site has not been photographed in 360 yet, so there is no immersive imagery to accompany this description.

Conditions on the Three Forks change quickly. Check the gauge the morning you float.

Parking + facilities

No facilities
Packed dirt parking
No designated accessible parking
No accessible route to the water

Safety

Conditions change rapidly on all three forks.

Neighbor sites

The river flows this way →

Upstream WILD · GREAT BEAR WILDERNESS

Downstream Confluence

Middle Fork · where this site sits

5,324 ft RM 97.4 · headwaters 2,295 ft of drop · 23.5 ft per mile average · whitewater reach · hatched: no access site 3,029 ft confluence

Elevation sampled from USGS 10m along the Wild & Scenic centerline. Hover or focus a site to see the panorama closest to the water.

Homelands

The river system flows through the traditional homelands of the Ql'ispe (Kalispel or Pend d' Orielle) Ktunaxa/Ksanka (Kootenai), and Séliš (Salish or "Flathead") Nations, who have long cared for this landscape, and the Amskapii Pikuni (Blackfeet) Peoples who often traveled in the river corridor.

About the homelands FRA's own acknowledgment language appears here verbatim.